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Lazarus NR, Harridge SD.Lazarus NR, et al.J Gerontol A Biol Sci Med Sci. 2010 Aug;65(8):854-7. doi: 10.1093/gerona/glq016. Epub 2010 Feb 22.J Gerontol A Biol Sci Med Sci. 2010.PMID: 20177134